Run results for: Compare chars

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36

Browser: Chrome 115

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Assign to new var & compare	2788138.2 Ops/sec
Assign to new var, change & compare	2629816.0 Ops/sec

HTML Preparation code:

<input />

Script Preparation code:

window.input = document.querySelector('input');
window.input.value = 'This is very long text very long text';
window.vWas = input.value;
window.vSame = input.value;

input.value += "!!!";
window.vDiff = input.value;

Tests:

Compare by char
for (let i = 0; i < vDiff.length; ++i) { if (vWas[i] !== vDiff[i]) { break; } }
Compare by char-code
for (let i = 0; i < vDiff.length; ++i) { if (vWas.charCodeAt(i) !== vDiff.charCodeAt(i)) { break; } }
Compare whole strings (different)
let isChanged = vWas !== vDiff;
Compare whole strings (same)
let isChanged = vWas === vSame;

Run results for: Compare chars

Compare by char

Compare by char-code

Compare whole strings (different)

Compare whole strings (same)